MODFLOW 2. 0: A program for predicting moderator flow patterns
- California Univ., Berkeley, CA (United States). Dept. of Nuclear Engineering
- Westinghouse Savannah River Co., Aiken, SC (United States)
Sudden changes in the temperature of flowing liquids can result in transient buoyancy forces which strongly impact the flow hydrodynamics via flow stratification. These effects have been studied for the case of potential flow of stratified liquids to line sinks, but not for moderator flow in SRS reactors. Standard codes, such as TRAC and COMMIX, do not have the capability to capture the stratification effect, due to strong numerical diffusion which smears away the hot/cold fluid interface. A related problem with standard codes is the inability to track plumes injected into the liquid flow, again due to numerical diffusion. The combined effects of buoyant stratification and plume dispersion have been identified as being important in operation the Supplementary Safety System which injects neutron-poison ink into SRS reactors to provide safe shutdown in the event of safety rod failure. The MODFLOW code discussed here provides transient moderator flow pattern information with stratification effects, and tracks the location of ink plumes in the reactor. The code, written in Fortran, is compiled for Macintosh II computers, and includes subroutines for interactive control and graphical output. Removing the graphics capabilities, the code can also be compiled on other computers. With graphics, in addition to the capability to perform safety related computations, MODFLOW also provides an easy tool for becoming familiar with flow distributions in SRS reactors.
- Research Organization:
- Savannah River Site (SRS), Aiken, SC (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC09-89SR18035
- OSTI ID:
- 5112906
- Report Number(s):
- WSRC-TR-91-448; ON: DE92016491
- Country of Publication:
- United States
- Language:
- English
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MODFLOW 2.0: A program for predicting moderator flow patterns
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42 ENGINEERING
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
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M CODES
MODERATORS
COMPUTER GRAPHICS
HEAT TRANSFER
HYDRAULICS
SAVANNAH REACTOR
STRATIFICATION
TEMPERATURE DISTRIBUTION
TRANSIENTS
COMPUTER CODES
ENERGY TRANSFER
ENRICHED URANIUM REACTORS
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PROPULSION REACTORS
PWR TYPE REACTORS
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SHIP PROPULSION REACTORS
THERMAL REACTORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
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420400 - Engineering- Heat Transfer & Fluid Flow
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